WebLETS is a fully web-enabled LETSystem (Local Exchange and Trade System), incorporating most if not all typical functionality of traditional LETS software and/or paper based systems. This may now be the best open source LETS software availiable.

Java implementation of a comma separated values, CSV, reader and writer based on RFC 4180. This format is exactly as Excel handles CSV files. CSV4180 is simple to use and understand with a commercial friendly MIT license.

CleanSheets is the first spreadsheet application that is both extensible and platform-independent. It features a formula language that closely resembles that of Microsoft Excel, and extensions for aiding end-user programmers develop correct spreadsheets.

Cash register machine software (POS software) for small retail businesses and shops. Can manage numerous counters using a web based network architecture. Based on Open Source softwares (Apache, PHP, PostgreSQL).

Italian web based financial monitoring system. Balance sheets, indices, reclassifications, sensor of attention, trend diagrams. 6 years online. More than 2500 voices of accounts and algorithms. Modelling system to make your own algorithms, sheets,indices

GnuLedger - an open source financial solution. GnuLedger includes all of the functionality that home users need to manage their finances, and is currently being re-written in PHP to provide for a faster, cleaner, and simpler application.